2. AddAdd 50 40 30 20 10SubtractSubtractMultiplyMultiplyDivideDivide Misc Mental Math Misc Math 170 – Chapter 3 and 4 50 40 30 20 10 50 40 30 20 10 50 40 30 20 10 FINAL 40 30 20 10

3. Addition

4. CheckWork Go Home Go Home 10 Point Question Sketch which base 5 pieces you would need to represent 1023 5 ?

5. CheckWork Go Home Go Home Rewrite 3+(2+6) using only the commutative property of addition once. 20 Point Question

6. Use only the associative property of addition to rewrite 3+(6+2). CheckWork Go Home Go Home 30 Point Question

7. CheckWork Go Home Go Home 40 Point Question Add the following: 233 5 +143 5

8. CheckWork Go Home Go Home Explain how to mentally compute 237 + 140 + 23 50 Point Question

9. Subtraction

10. CheckWork Go Home Go Home Two models for subtraction are the comparison concept and the missing addend concept. What is the third model? 10 Point Question

11. CheckWork Go Home Go Home 20 Point Question Show, with base-5 pieces 21 5 – 14 5.

12. CheckWork Go Home Go Home 30 Point Question Harry has $2500 in cash to pay for a secondhand car, or he can pay $500 down and $115 per month for 2 years. If he doesn’t pay the full amount in cash, he can invest the difference and make $150. How much money will he lose if he chooses the more expensive option?

13. CheckWork Go Home Go Home How can the comparison model for subtraction be used to compute 34 – 29? 40 Point Question

14. CheckWork Go Home Go Home How does the take away model for subtraction apply to the problem 43-12? 50 Point Question

15. Multiplication

16. CheckWork Go Home Go Home Which property of multiplication is illustrated below? 1. a = a. 1 = a 10 Point Question

17. CheckWork Go Home Go Home Find the product 13 5 and 32 5 20 Point Question

18. CheckWork Go Home Go Home Draw an array showing 23 x 14. How many squares are enclosed? 30 Point Question

19. CheckWork Go Home Go Home A store carries five styles of backpacks in four different sizes. The customer also has a choice of two different kinds of material. How many different choices does a customer have? 40 Point Question

20. CheckWork Go Home Go Home Multiplying a 4 digit number by this number is easy: just write the 4 digit number down twice in a row. What is the number? 50 Point Question

21. Division

22. CheckWork Go Home Go Home 10 Point Question What are the three models for division?

23. CheckWork Go Home Go Home Sketch two ways to divide 48 by 8. 20 Point Question

24. Use sketches of base 5 pieces to show 142 five divided by 11 five. CheckWork Go Home Go Home 30 Point Question

25. Go Home Go Home 40 Point Question CheckWork Evaluate 1440/12X10+18

26. CheckWork Go Home Go Home 50 Point Question Find the quotient of 4052 and 8. (Using whole number division.)

27. Mental Math

28. CheckWork Go Home Go Home Which two numbers are compatible for addition? 42, 37, 81, 55, 24, 33 10 Point Question

29. Explain how to do the following problem using mental math. 21X36 + 21X64 CheckWork Go Home Go Home 20 Point Question

30. CheckWork Go Home Go Home 30 Point Question Use the range method to get estimates for 236+153.

31. Explain how to use the compensation method to find 248+296. CheckWork Go Home Go Home 40 Point Question

32. CheckWork Go Home Go Home Final Question In the standard multiplication algorithm, why do we “shift over one to the left” as illustrated in the 642 in the following problem? 321 X 23 963+642